Uses DMA to read/write SPI blocks, while putting the current thread in Wait state.
RTOS_SPI_LPC1768.cpp
- Committer:
- Tomo2k
- Date:
- 2014-06-27
- Revision:
- 2:d052724e2ad6
- Parent:
- 1:d021fb155bff
File content as of revision 2:d052724e2ad6:
#ifdef TARGET_LPC1768 #include "RTOS_SPI.h" RTOS_SPI::RTOS_SPI(PinName mosi, PinName miso, PinName sclk, PinName _unused) : SPI(mosi, miso, sclk) { if (_spi.spi == LPC_SSP0) { read_dma.trigger(Trigger_SSP0_RX); write_dma.trigger(Trigger_SSP0_TX); } else { read_dma.trigger(Trigger_SSP1_RX); write_dma.trigger(Trigger_SSP1_TX); } read_dma.source(&_spi.spi->DR, false, 8); write_dma.destination(&_spi.spi->DR, false, 8); }; void RTOS_SPI::bulkInternal(uint8_t *read_data, const uint8_t *write_data, int length, bool read_inc, bool write_inc) { aquire(); _spi.spi->DMACR = 3; read_dma.destination(read_data, read_inc); write_dma.source(write_data, write_inc); read_dma.start(length); write_dma.wait(length); while(read_dma.isBusy()); _spi.spi->DMACR = 0; } #endif